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Contents
- The climate of Ashburn
- The best time to visit Ashburn
- The worst time to visit Ashburn
- Spring weather in Ashburn
- Summer weather in Ashburn
- Autumn weather in Ashburn
- Winter weather in Ashburn
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
The climate of Ashburn
The city of Ashburn, Virginia is nested within the Humid Subtropical climate, as per the Köppen climate classification. This climate is defined by its code, Cfa and is dictated by a lack of dry season. The geographical positioning of Ashburn ushers in a diversity of weather patterns across the year evolving from temperate winter to hot, humid summer.
Analyzing the data across the twelve months, clear seasonal distribution in weather parameters is observed. The average high temperature progresses from a chilly 39.7°F (4.3°C) in January to a hot 87.8°F (31°C) in July. On the contrary, the average low temperature ranges from a frosty 25.9°F (-3.4°C) in January to a much warmer 67.3°F (19.6°C) in July. Relative humidity, averaging annually in the mid-seventies percentile, registers the lowest at 70% in July and peaks at its highest of 78% in December.
Unique climate patterns shape some months distinctively: January and February witness snowfall, with January seeing an average of 3.54" (90mm) and February a slightly lower 3.27" (83mm). Rainfall is relatively evenly distributed across the year, with August bearing the brunt of the year's rain at 3.78" (96mm).
Analyzing the data across the twelve months, clear seasonal distribution in weather parameters is observed. The average high temperature progresses from a chilly 39.7°F (4.3°C) in January to a hot 87.8°F (31°C) in July. On the contrary, the average low temperature ranges from a frosty 25.9°F (-3.4°C) in January to a much warmer 67.3°F (19.6°C) in July. Relative humidity, averaging annually in the mid-seventies percentile, registers the lowest at 70% in July and peaks at its highest of 78% in December.
Unique climate patterns shape some months distinctively: January and February witness snowfall, with January seeing an average of 3.54" (90mm) and February a slightly lower 3.27" (83mm). Rainfall is relatively evenly distributed across the year, with August bearing the brunt of the year's rain at 3.78" (96mm).
The best time to visit Ashburn
Considering the variety of weather factors, the most favorable time to explore Ashburn falls between May to October. During these months, the city experiences a mild to warm climate, with the average high temperature poised between 75°F (23.9°C) to 87.8°F (31°C) and the low averaging from 55°F (12.8°C) to 67.3°F (19.6°C). Additionally, a relatively low humidity of 72% to 74% combined with longer daylight hours, peaking at 14.9 hours in June, present desirable conditions for sightseeing and outdoor activities.
The worst time to visit Ashburn
While Ashburn retains a certain charm throughout the year, January and February might not be the most appealing months for a visit. During these months, Ashburn experiences the lowest average temperatures, with January's high and low dropping to 39.7°F (4.3°C) and 25.9°F (-3.4°C) respectively. Coupled with an increased probability of snowfall, the cold weather could potentially hamper outdoor explorations.
Spring weather in Ashburn
Spring in Ashburn signals a transition from winter's chill to the warmth of summer. From March to May, temperatures show a steady incline with the average high surging from 52.5°F (11.4°C) to 75°F (23.9°C) and the average low following suit, rising from 35.6°F (2°C) to 55°F (12.8°C). The daylight hours increase considerably during Spring, starting from 12 hours in March and reaching 14.3 hours by May.
Summer weather in Ashburn
Enjoyably warm summer in Ashburn lasts from June to August, with temperatures soaring to reach a high from 82.8°F (28.2°C) to 87.8°F (31°C). Nights remain comfortably mild, with the average low ranging from 62.4°F (16.9°C) to 67.3°F (19.6°C). However, despite the rise in temperature, relative humidity remains on the lower side, averaging around 72%, keeping the overall climate comfortable.
Autumn weather in Ashburn
Autumn witnesses a gradual decline in temperature, starting with a high of 78.3°F (25.7°C) in September and descending to a more modest 53.6°F (12°C) by November. With a similar downward trend, the average low transitions from 59.7°F (15.4°C) down to 37.8°F (3.2°C) in this period. Despite the temperature drop, sunlight duration exhibits a relatively slower decrease, from 12.4 hours in September to 10.1 hours by November's end.
Winter weather in Ashburn
Winter weather in Ashburn is cold and often frosty. December commences with an average high of 45.1°F (7.3°C), dropping further by January and slightly rising in February. The low temperatures maintain a chilly atmosphere, moving between 25.9°F (-3.4°C) to 32°F (0°C) throughout the winter months. Winter also brings snowfall, with January having a peak snowfall of 3.54" (90mm), contributing to the beauty of Ashburn's winter landscape.
Weather in January
January greets Ashburn with cold winter weather, stark contrasts between day and night temperatures are noticeable. While the month is cooler than February, the lowest temperature dips to 25.9°F (-3.4°C), yet not dipping as much as the following December. Weather in January »
Weather in February
Paving the way for spring, February is slightly warmer than January and less cold than March. The number of sunshine days is relatively less than in January while still offering over 10 hours of daylight. Falling snow can be expected up to five days, thankfully less snowfall is expected compared to previous January. Weather in February »
Weather in March
March signals the beginning of spring in Ashburn, with noticeable changes in weather patterns from February to April. The transition from winter can be appreciated with a temperature increase from February and lesser snowfall days. Weather in March »
Weather in April
April in Ashburn brings about a significant change with a noticeable leap in temperature from March to May. April's mornings are no longer as frigid, with average low temperatures rising to 45.7°F (7.6°C). The significant decrease in snowfall, reduced to just 0.28" (7mm), is replaced with rains spanning over 15 days. Weather in April »
Weather in May
May is inherently mild in Ashburn, with temperatures and weather conditions smoothing the transition from April to June. There is a noticeable shift in rainfall, peaking at 3.11" (79mm), and hinting at the approaching summer showers. Weather in May »
Weather in June
Summer arrives in full swing in June, showcasing a different facet of Ashburn's weather. Temperatures continue to rise from May to July, and quantity of daylight hours increases to the highest level. June also marks the point in the year with the highest hours of sunshine at 10.1 hours, illuminating the city for longer periods. Weather in June »
Weather in July
July in Ashburn is the zenith of summer heat, with temperatures reaching their peak, higher than June and August. The relative humidity remains balanced, providing a comforting counterpoint to the increasing heat. The highest temperature recorded in July is a blistering 87.8°F (31°C), signifying the intensity of summer. Weather in July »
Weather in August
August weather in Ashburn is characterized by consistently high temperatures similar to July, signifying a continuation of the summer blaze. With nearly 14 hours of daylight, August boasts the second-highest daylight figures for the year. Weather in August »
Weather in September
In September, Ashburn's weather hints at the advent of autumn, with temperatures falling from those seen in August to October. The decrease in daylight hours from August heralds the approaching change in season, manifesting itself in the reddening leaves. Weather in September »
Weather in October
Cooler days characterize October in Ashburn as the shift from September to November marks the transition to crisp temperatures. Although the rainfall increases from September, it remains lower than in November, creating a relatively dry time. Weather in October »
Weather in November
November brings Ashburn into the end of autumn and presents a noticeable change in weather from October to December. Despite the falling temperatures, November stands out because it sees the return of snowfall at 0.12" (3mm), the first since the previous April. Weather in November »
Weather in December
December in Ashburn heralds the winter season, and with it comes a marked shift in weather when compared to November and followed by January. The contrast lies most notably in its temperatures, with the lowest recorded at 32°F (0°C), serving as a precursor to January's colder days. Weather in December »
Updated: Jun 24, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest month?
The coldest temperatures occur during January, when averages reach a peak of 39.7°F (4.3°C) and a low of 25.9°F (-3.4°C).
How much does it rain?
In Ashburn, during the entire year, the rain falls for 158.1 days and collects up to 31.46" (799mm) of precipitation.
When does it snow?
Months with snowfall are January through April, November and December.
What is the snowiest month?
January is the month with the most snowfall. Snow falls for 5.1 days and accumulates 3.54" (90mm) of snow.
How much does it snow?
Throughout the year, there are 16.7 snowfall days, and 12.28" (312mm) of snow is accumulated.
What are the months with the least sunshine?
The months with the least sunshine are January, February and December, with an average of 5h of sunshine.
What are the months with the lowest UV index?
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.
When is Daylight Saving Time (DST)?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from EDT to EST.
When it does not snow?
In Ashburn, snow does not fall in May through October.
What are the months with the highest UV index?
The months with the highest UV index are May through August, with an average maximum UV index of 6.
When are the longest days?
With an average of 14h and 54min of daylight, June has the longest days of the year in Ashburn.
What part of the year is the hottest?
Ashburn registers the average highest temperatures during July, with peaks of 87.8°F (31°C) and lows of 67.3°F (19.6°C).
What is the least humid month?
The least humid month is July, with an average relative humidity of 70%.
What month has the most sunshine?
July has the most sunshine of the year, with an average of 10.7h of sunshine.
What is the wettest month?
The month with the most rainfall is August, when the rain falls for 16.7 days and typically aggregates up to 3.78" (96mm) of precipitation.
What is the driest month?
September is the month with the least rainfall. Rain falls for 12.6 days and accumulates 1.93" (49mm) of precipitation.
What is the most humid month?
With an average relative humidity of 78%, December is the most humid month.
What is the month with the shortest days?
December has the shortest days of the year, with an average of 9h and 30min of daylight.
Average temperature
Ashburn, VA
The warmest month (with the highest average high temperature) is July (87.8°F).
The month with the lowest average high temperature is January (39.7°F).
The month with the highest average low temperature is July (67.3°F).
The coldest month (with the lowest average low temperature) is January (25.9°F).
Average pressure
Ashburn, VA
- Average pressure in January:
30.11"Hg - Average pressure in February:
30.07"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.99"Hg - Average pressure in May:
30.01"Hg - Average pressure in June:
29.95"Hg
- Average pressure in July:
29.97"Hg - Average pressure in August:
29.99"Hg - Average pressure in September:
30.05"Hg - Average pressure in October:
30.04"Hg - Average pressure in November:
30.14"Hg - Average pressure in December:
30.11"Hg
The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed
Ashburn, VA
- Average wind speed in January:
7.2mph - Average wind speed in February:
7.3mph - Average wind speed in March:
7.5mph - Average wind speed in April:
7.4mph - Average wind speed in May:
6mph - Average wind speed in June:
5.5mph
- Average wind speed in July:
4.8mph - Average wind speed in August:
4.7mph - Average wind speed in September:
5.3mph - Average wind speed in October:
6.2mph - Average wind speed in November:
6.5mph - Average wind speed in December:
6.6mph
The windiest month (with the highest average wind speed) is March (7.5mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).
Average humidity
Ashburn, VA
The month with the highest relative humidity is December (78%).
The month with the lowest relative humidity is July (70%).
Average rainfall
Ashburn, VA
- Average rainfall in January:
2.13" - Average rainfall in February:
2.2" - Average rainfall in March:
2.44" - Average rainfall in April:
2.8" - Average rainfall in May:
3.11" - Average rainfall in June:
2.48"
- Average rainfall in July:
3.03" - Average rainfall in August:
3.78" - Average rainfall in September:
1.93" - Average rainfall in October:
2.52" - Average rainfall in November:
2.36" - Average rainfall in December:
2.68"
The wettest month (with the highest rainfall) is August (3.78").
The driest month (with the least rainfall) is September (1.93").
Average rainfall days
Ashburn, VA
- Average rainfall days in January:
9.3 days - Average rainfall days in February:
10.5 days - Average rainfall days in March:
13 days - Average rainfall days in April:
15.4 days - Average rainfall days in May:
17.5 days - Average rainfall days in June:
14.8 days
- Average rainfall days in July:
16.3 days - Average rainfall days in August:
16.7 days - Average rainfall days in September:
12.6 days - Average rainfall days in October:
12 days - Average rainfall days in November:
9.5 days - Average rainfall days in December:
10.5 days
The month with the highest number of rainy days is May (17.5 days).
The month with the least rainy days is January (9.3 days).
Average snowfall
Ashburn, VA
The month with the highest snowfall is January (3.54").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days
Ashburn, VA
- Average snowfall days in January:
5.1 days - Average snowfall days in February:
5.1 days - Average snowfall days in March:
3 days - Average snowfall days in April:
0.3 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0 days - Average snowfall days in November:
0.5 days - Average snowfall days in December:
2.7 days
The months with the highest number of snowfall days are January and February (5.1 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Ashburn, VA
- Average daylight in January:
9h and 5min - Average daylight in February:
10h and 5min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 2min - Average daylight in May:
14h and 2min - Average daylight in June:
14h and 5min
- Average daylight in July:
14h and 4min - Average daylight in August:
13h and 4min - Average daylight in September:
12h and 2min - Average daylight in October:
11h and 1min - Average daylight in November:
10h and 1min - Average daylight in December:
9h and 3min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in January:
5h and 0min - Average sunshine in February:
5h and 0min - Average sunshine in March:
6h and 4min - Average sunshine in April:
8h and 4min - Average sunshine in May:
8h and 4min - Average sunshine in June:
10h and 1min
- Average sunshine in July:
10h and 4min - Average sunshine in August:
10h and 0min - Average sunshine in September:
8h and 4min - Average sunshine in October:
5h and 3min - Average sunshine in November:
5h and 4min - Average sunshine in December:
5h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The months with the least sunshine are January, February and December (Average sunshine: 5h and 0min).
Average sunshine days
Ashburn, VA
- Average sunshine days in January:
17.2 days - Average sunshine days in February:
14.3 days - Average sunshine days in March:
15.3 days - Average sunshine days in April:
12.8 days - Average sunshine days in May:
12.1 days - Average sunshine days in June:
13.6 days
- Average sunshine days in July:
11.8 days - Average sunshine days in August:
12.1 days - Average sunshine days in September:
15.9 days - Average sunshine days in October:
17.3 days - Average sunshine days in November:
19.5 days - Average sunshine days in December:
17.5 days
The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is July (11.8 days).
Average UV index
Ashburn, VA
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover
Ashburn, VA
The month with the most cloud cover is March (Cloud cover 48).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility
Ashburn, VA
The months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is May (5mi).
Ashburn, Virginia, USA
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